Re: Wrong password hash algorithm returned

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On 11/22/22 10:28, Julian Kippels wrote:
Hi Thierry,

that's a nasty catch…

On the one hand I think this is a nice feature to improve security, but on the other hand PBKDF2_SHA256 is the one algorithm that freeradius cannot cope with.

I suppose there is no way to revert all changed hashes after I set "nsslapd-enable-upgrade-hash" to "off"? Other than to reinitialize all affected suffixes from the export of the old servers?


Indeed this is a bad side effect of the default value :(

If you need to urgently fix those new {PBKDF2_SHA256}, then reinit is the way to go. Else you could change the default password storage to SSHA and keep nsslapd-enable-upgrade-hash=on. So that it will revert, on bind, to the SSHA hash.

thierry


Julian

Am 22.11.22 um 09:56 schrieb Thierry Bordaz:
Hi Julian,

This is likely the impact of https://github.com/389ds/389-ds-base/issues/2480 that was introduced in 1.4.x.

On 1.4.4 default hash is PBKDF2, this ticket upgrade hash of user entries during the user bind (enabled with nsslapd-enable-upgrade-hash).

best regards
thierry

On 11/22/22 09:25, Julian Kippels wrote:
Hi,

We have a radius server that reads the userPassword-attribute from ldap to authenticate users. There is a strange phenomenon where sometimes the answer from the ldap-server gives the wrong password hash algorithm. Our global password policy storage scheme is set to SSHA. When I perform a ldapsearch as directory manager I see that the password hash for a given user is {SSHA}inserthashedpasswordhere. But when I run tcpdump to see what our radius is being served I see {PBKDF2_SHA256}someotherhash around 50% of the time. Sometime another request from radius a few seconds after the first one gives the correct {SSHA} response.

This happened right after we updated from 389ds 1.2.2 to 1.4.4.
I am a bit stumped.

Thanks in advance,
Julian
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